They had estimated the yearly increase in sky brightness to be about 2 percent a year.
他们估计天空亮度每年增加约2%。
单词 | sky brightness |
例句 |
原声例句
VOA慢速英语_世界 They had estimated the yearly increase in sky brightness to be about 2 percent a year. 他们估计天空亮度每年增加约2%。 |
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